EP1497908A1 - Schaltungsanordnung mit leistungsfaktorkorrektur und entsprechendes gerät - Google Patents
Schaltungsanordnung mit leistungsfaktorkorrektur und entsprechendes gerätInfo
- Publication number
- EP1497908A1 EP1497908A1 EP03727300A EP03727300A EP1497908A1 EP 1497908 A1 EP1497908 A1 EP 1497908A1 EP 03727300 A EP03727300 A EP 03727300A EP 03727300 A EP03727300 A EP 03727300A EP 1497908 A1 EP1497908 A1 EP 1497908A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- switch
- mains
- switching
- power supply
- coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- the present invention relates to a circuit arrangement having a switch-mode power supply as claimed in the preamble clause of claim 1, and on an appliance having a corresponding circuit arrangement .
- Switch-mode power supplies produce a- heavily pulsed load on the electrical power supply system, which leads to harmonic currents in electrical power supply systems.
- This load occurs in the region of the voltage maxima of the sinusoidal mains voltage, at which voltage maxima an energy-storage capacitor for the switch-mode power supply is recharged.
- Appliances having a relatively high power consumption such as televisions with relatively large picture tubes, now therefore have to comply with specific regulations relating to harmonic currents.
- the harmonic load on the electrical power supply system caused by an appliance can in this case be stated as a so-called power factor.
- a further possible way to improve the power factor of a switch-mode power supply is to use a coil in the input area of the switch-mode power supply.
- This coil is also referred to as a 50 Hz coil, a mains frequency coil or a power factor coil.
- the description therefore always uses the expression power factor coil for this coil.
- this power factor coil has the disadvantage that the current flow in the power factor coil is interrupted suddenly when the mains switch is operated in order to switch off the appliance.
- the energy which is stored in the coil must be dissipated, however. Since the open mains switch represents the highest impedance in the circuit, a very high voltage is therefore developed across the switching contacts of the mains switch, and causes an arc. This causes the mains switch to age more quickly, and the switch represents a safety risk since, in the worst case, it becomes a potential fire source.
- the object of the present invention is to specify a circuit arrangement and a corresponding appliance of the type mentioned initially, which have a high reliability, combined with a low circuit complexity.
- the circuit arrangement according to the invention has a mains connection, a mains switch with two switching contacts, a demagnetization coil and a switch-mode power supply, which comprises a driver circuit for producing a control voltage for the switching transistor of the switch-mode power supply.
- a first switching contact of the mains switch is arranged here between the mains connection and the demagnetization coil in order to switch the demagnetization coil on and off, and the second switching contact is connected to a supply or control voltage for the driver circuit, in order to switch off the control voltage for the switching transistor or in order to switch off the switch-mode power supply.
- the circuit arrangement can be used in particular in appliances having a picture tube, for example televisions and computer monitors.
- This mains switch circuitry in this case ensures that the picture tube is demagnetized whenever the appliance is switched on.
- Figure 1 shows a circuit arrangement having a mains connection, a power factor coil and a switch- mode power supply, as well as a mains switch
- Figure 2 shows the use of the arrangement in a chassis of a television.
- FIG. 1 shows a switch-mode power supply I schematically, which has a rectifier means, in this exemplary embodiment a bridge rectifier BR with four diodes, an energy-storage capacitor Cl and transformer TR with a primary winding Wl, an auxiliary winding W2 arranged on the primary side and secondary windings W3 , W4 and W5 arranged on the secondary side.
- the energy- storage capacitor Cl is in this case arranged between the bridge rectifier BR and the primary winding Wl .
- a switching transistor Tl is connected in series with the primary winding Wl and is controlled by a control voltage DS for a driver circuit DC.
- a supply voltage VCC is provided for operation of the switch-mode power supply via the auxiliary winding W2 , a diode Dl and capacitor C2 , and is supplied to the driver circuit DC.
- the switch-mode power supply I in Figure 1 is a part of a circuit arrangement which also has a mains connection NA, a demagnetization coil (which is not illustrated) and a mains switch SI with two switching contacts 1, 2.
- the circuit arrangement is preferably integrated in an appliance, for example a television, which has a picture tube.
- Picture tubes which are used in televisions or computer monitors, need to be demagnetized from time to time in order to preserve the color purity of the picture tube. This is accomplished by means of a demagnetization coil, through which an AC voltage normally flows during the process of switching on the appliance.
- the 220 volt mains voltage is used as the AC voltage in this case and produces a high current surge at the time when the appliance is switched on, and which then subsequently decays gradually.
- the decay is accomplished by means of a posistor, which is heated by the high current with its impedance in consequence becoming high.
- the driver circuit DC is supplied with a regulating signal RS which is derived from a supply voltage U4 on the secondary side, for example from the system voltage in a television, and is transmitted via an opto coupler or an isolating transformer (which is not illustrated) to the primary side of the switch-mode power supply.
- a regulating signal RS which is derived from a supply voltage U4 on the secondary side, for example from the system voltage in a television
- a so-called snubber network SN is arranged in parallel with the primary winding Wl and is used to damp voltage spikes which occur during the process of switching off the switching transistor Tl .
- the switch-mode power supply also contains a starting circuit AS, which supplies the driver stage DC with a current for the starting phase of the switch-mode power supply after the appliance in which the circuit arrangement is integrated has been switched on.
- the starting circuit AS supplies the driver stage DC with a current for the starting phase of the switch-mode power supply after the appliance in which the circuit arrangement is integrated has been switched on.
- AS is normally a high-value resistor chain, which produces a connection between the bridge rectifier BR and the capacitor C2.
- the supply voltage VCC is produced by the auxiliary winding W2, as well as by the diode Dl and the filter capacitor C2.
- the switch-mode power supply illustrated in the figure preferably operates on the basis of the fly back converter principle, although other circuit principles are likewise possible.
- Fly back converters are preferably used in entertainment electronics appliances, for example in televisions and video recorders. In a fly back converter, energy is in this case stored in the transformer TR during the phase in which the switching transistor Tl is switched on, and is then subsequently transmitted to the windings W3-W5 on the secondary side, and to the auxiliary winding W2 on the primary side, in the phase during which the switching transistor is switched off. Fly back converters are used both as AC/DC converters and as DC/DC converters.
- Switch-mode power supplies of this type have a low power factor, since the energy-storage capacitor Cl is recharged only in the region of the voltage maxima and minima of the 50 Hz mains voltage, when the output voltage U2 of the bridge rectifier BR exceeds the voltage value across the energy-storage capacitor Cl .
- One simple possible way to improve the power factor of a switch-mode power supply is to use a mains frequency coil or power factor coil NS, which is arranged between the mains connection NA and the energy-storage capacitor Cl . In this exemplary embodiment, it is connected between the mains connection NA and the mains rectifier BR.
- the power factor coil NS results in the pulsed current flow which is used to recharge the energy-storage capacitor Cl being broadened and shifted in phase, since the inductance of this coil, for example 50 mH, means that the current flow through the coil rises only gradually, and decays again in a damped manner.
- a power factor which complies with the requirements is achieved in this case by appropriate choice of the inductance value .
- Figure 1 likewise shows a mains switch SI, which has two switching contacts 1 and 2, as well as corresponding connections a and b for the switching contact 1, and c and d for the switching contact 2.
- the mains switch SI is in this case normally arranged on the front face of the appliance, such that it is easily accessible for a user.
- the connections c and d are in this case according to the invention connected to the connections c' and d' for switching the driver circuit DC of the switch-mode power supply on and off, and the connections a and b are connected to the magnetization coil for switching the demagnetization coil on and off.
- the power factor coil NS is not arranged in the current path of the mains switch SI.
- the mains switch is therefore not loaded by the power factor coil NS when the appliance is switched on and off.
- this arrangement ensures that the demagnetization coil is switched on, in order to demagnetize the picture tube, on each occasion when the appliance is switched on.
- Figure 2 shows the major components of the circuit arrangement , to the extent that they are integrated on a chassis of a television in an advantageous refinement.
- the arrangement On the input side, the arrangement has a filter section with a mains filter NF, capacitors C3 and C4 and a resistor Rl, which filter section is connected to the mains connection NA of the arrangement.
- This filter section prevents radiated interference from the appliance entering the mains system and suppresses any interference which is already present on the mains system.
- the filter section is connected to the bridge rectifier BR, which provides the rectified voltage U2 for operation of the switch-mode power supply.
- Connections e and f are arranged in the connection between the bridge rectifier and the filter section, to which the power factor coil NS, which is not illustrated in Figure 2, is connected.
- the power factor coil is arranged separately, so that the switch-mode power supply can be kept compact and, in particular, such that an already existing switch-mode power supply which does not have power factor correction can be used without any major design change.
- the arrangement of the power factor coil NS upstream of the bridge rectifier BR means that it is located in the current path of the sinusoidal AC voltage of the mains system.
- the driver circuit DC and the transformer TR for the switch-mode power supply are indicated only schematically in Figure 2, to the extent that it is necessary for understanding of the invention.
- a diode Dl and a capacitor C2 are arranged on the auxiliary winding W2, which is arranged on the primary side, in order to produce the operating voltage VCC for the driver circuit.
- Two connection points c' and d' are arranged on the chassis in the connection between the capacitor C2 and the driver circuit DC, and are connected to the connection points c and d of the mains switch SI.
- a capacitor C6 with a capacitance of 1 ⁇ F is also advantageously connected to ground between the connection c' and the driver circuit DS, and is used to avoid switch bouncing of the switching contact 2 and to provide filtering for the long supply line to the mains switch SI.
- the capacitance of this capacitor in this case also influences the number of switching cycles after which the switching transistor Tl is completely switched off.
- a posistor PS and a capacitor C5 to which the demagnetization coil ES (which is not illustrated) is connected via connection points g and h are also arranged on the chassis.
- the posistor PS On the input side, the posistor PS is arranged in parallel with the capacitor C3.
- Connection points a' and b' which are connected to the connection points a and b of the mains switch SI, are in this case located in a supply.
- the demagnetization coil ES is switched on whenever the mains switch SI is operated in order to switch on the appliance.
- the posistor PS in this case ensures a large current surge at the moment of switching on, which is reduced continuously to a low loss level by the heating of the posistor.
- the switch-mode power supply can be started via the switching contact 2, since the driver circuit DC is in this case supplied with the operating voltage VCC.
- the switch-mode power supply thus behaves in precisely the same way as when using the mains switch SI in appliances of a conventional type.
- the switching contact 2 switches off the switching transistor Tl in a short time, so that no more energy is transmitted in the transformer TR to the second windings W2 - W5.
- the switching voltage DS for the switching transistor Tl is switched off directly or indirectly by the driver circuit.
- the switching contact 2 is advantageously connected to the connection points c' and d' , as described with reference to Figure 2, so that the driver circuit DC is disconnected from the supply voltage VCC during the switching-off process.
- another voltage of the driver circuit DC for example a control voltage for the driver circuit DC, can also be switched off in a corresponding manner by the switching contact 2, or the switching contact 2 can be used to regulate the regulating signal RS at a predetermined voltage level, so that the switching transistor Tl is likewise switched off permanently.
- the mains connection NA is thus connected to the bridge rectifier BR without being switched, without a mains switch.
- the switch-mode power supply I is thus always connected to the electrical power supply system whenever the mains plug of the appliance is connected to the electrical power supply system.
- the power factor coil NS is not arranged in the current path of the mains switch SI, so that the life of the mains switch SI is considerably improved.
- the invention is not restricted to switch-mode power supplies based on the flyback converter principle, as already explained above, and can also be used for other switch-mode power supply concepts when power factor correction is required.
- the invention can also be used in appliances which do not have power factor correction.
- the connection points e and f can be short- circuited in appliances for countries which do not require power factor correction. In consequence, there is no need to modify the chassis in these appliances for these countries .
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
- Dc-Dc Converters (AREA)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10217951 | 2002-04-22 | ||
DE10217951A DE10217951A1 (de) | 2002-04-22 | 2002-04-22 | Schaltungsanordnung mit Powerfaktorkorrektur, sowie entsprechendes Gerät |
PCT/EP2003/003826 WO2003090335A1 (en) | 2002-04-22 | 2003-04-12 | Circuit arrangement with power factor correction, and corresponding appliance |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1497908A1 true EP1497908A1 (de) | 2005-01-19 |
EP1497908B1 EP1497908B1 (de) | 2006-06-14 |
Family
ID=28798680
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03727300A Expired - Lifetime EP1497908B1 (de) | 2002-04-22 | 2003-04-12 | Schaltungsanordnung mit leistungsfaktorkorrektur und entsprechendes gerät |
Country Status (10)
Country | Link |
---|---|
US (1) | US7120003B2 (de) |
EP (1) | EP1497908B1 (de) |
JP (1) | JP2005528871A (de) |
KR (1) | KR20040108746A (de) |
CN (1) | CN100392962C (de) |
AU (1) | AU2003233970A1 (de) |
CA (1) | CA2482976A1 (de) |
DE (2) | DE10217951A1 (de) |
MX (1) | MXPA04010445A (de) |
WO (1) | WO2003090335A1 (de) |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2835610A1 (de) * | 1978-08-14 | 1980-02-28 | Licentia Gmbh | Schaltung zur entmagnetisierung der bildroehre in einem farbfernsehempfaenger |
US4275438A (en) * | 1978-10-12 | 1981-06-23 | Induction Heating International, Inc. | Induction heating inverter |
US4295078A (en) * | 1980-05-12 | 1981-10-13 | Rca Corporation | Color television receiver degaussing circuit |
DE3418076C2 (de) * | 1984-05-16 | 1986-06-26 | Loewe Opta Gmbh, 8640 Kronach | Schaltungsanordnung zur automatischen Entmagnetisierung der Bildröhre in einem Farbfernsehempfänger |
US4866525A (en) | 1988-11-01 | 1989-09-12 | Thomson Consumer Electronics, Inc. | Television apparatus power supply |
US4930061A (en) * | 1989-04-07 | 1990-05-29 | At&T Bell Laboratories | Method and network for enhancing power factor of off-line switching circuit |
JPH0346885A (ja) * | 1989-07-11 | 1991-02-28 | Samsung Electron Co Ltd | リレーを用いたデガウシング回路 |
DE4041484A1 (de) * | 1990-12-22 | 1992-06-25 | Thomson Brandt Gmbh | Entmagnetisierungsschaltung fuer die bildroehre in einem fernsehempfaenger |
JPH04294011A (ja) * | 1991-03-25 | 1992-10-19 | Mitsubishi Electric Corp | 直流遮断器回路 |
DE4138493A1 (de) * | 1991-11-23 | 1993-05-27 | Thomson Brandt Gmbh | Schaltung zur entmagnetisierung der bildroehre in einen fernsehempfaenger |
DE4237634A1 (de) * | 1992-11-07 | 1994-05-11 | Nokia Deutschland Gmbh | Videoempfangsgerät mit einem Schaltnetzteil |
KR0132987B1 (ko) * | 1994-10-05 | 1998-04-20 | 김광호 | 스위칭 전원장치 |
KR970010216B1 (en) * | 1994-12-02 | 1997-06-23 | Samsung Electronics Co Ltd | Tilt control circuit for crt |
JP3184437B2 (ja) * | 1995-09-13 | 2001-07-09 | 株式会社大林組 | 直流スイッチ |
US5619404A (en) * | 1995-10-30 | 1997-04-08 | Zak; Alexander | Multi-channel single stage high power factor AC to DC converter |
KR100202640B1 (ko) * | 1995-12-07 | 1999-06-15 | 구본준 | 씨알티의 잔류자속 제거방법 |
JP3275689B2 (ja) * | 1996-02-19 | 2002-04-15 | 株式会社村田製作所 | 消磁回路および消磁回路用部品 |
JPH09237554A (ja) * | 1996-02-28 | 1997-09-09 | Mitsubishi Electric Corp | 直流遮断装置および直流電源装置 |
KR100198288B1 (ko) * | 1996-09-04 | 1999-06-15 | 구자홍 | 역률개선회로의 출력전압 안정화 회로 |
KR100438695B1 (ko) * | 2001-03-09 | 2004-07-05 | 삼성전자주식회사 | 전원 공급 제어 장치 및 방법 |
-
2002
- 2002-04-22 DE DE10217951A patent/DE10217951A1/de not_active Withdrawn
-
2003
- 2003-04-12 CN CNB038119862A patent/CN100392962C/zh not_active Expired - Fee Related
- 2003-04-12 WO PCT/EP2003/003826 patent/WO2003090335A1/en active IP Right Grant
- 2003-04-12 CA CA002482976A patent/CA2482976A1/en not_active Abandoned
- 2003-04-12 AU AU2003233970A patent/AU2003233970A1/en not_active Abandoned
- 2003-04-12 JP JP2003586989A patent/JP2005528871A/ja not_active Withdrawn
- 2003-04-12 DE DE60306141T patent/DE60306141T2/de not_active Expired - Fee Related
- 2003-04-12 MX MXPA04010445A patent/MXPA04010445A/es active IP Right Grant
- 2003-04-12 KR KR10-2004-7016780A patent/KR20040108746A/ko not_active Application Discontinuation
- 2003-04-12 EP EP03727300A patent/EP1497908B1/de not_active Expired - Lifetime
- 2003-04-12 US US10/511,834 patent/US7120003B2/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO03090335A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN100392962C (zh) | 2008-06-04 |
US20050206321A1 (en) | 2005-09-22 |
AU2003233970A1 (en) | 2003-11-03 |
DE60306141T2 (de) | 2007-04-19 |
MXPA04010445A (es) | 2004-12-13 |
DE60306141D1 (de) | 2006-07-27 |
CA2482976A1 (en) | 2003-10-30 |
US7120003B2 (en) | 2006-10-10 |
KR20040108746A (ko) | 2004-12-24 |
DE10217951A1 (de) | 2003-11-06 |
JP2005528871A (ja) | 2005-09-22 |
EP1497908B1 (de) | 2006-06-14 |
WO2003090335A1 (en) | 2003-10-30 |
CN1695289A (zh) | 2005-11-09 |
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